Genuine Mikuni Fuel Carb RS Smoothbore RS40-D12 for Kawasaki Ninja ZX900 ZX1000

Mikuni RS Smoothbore Carburetors
Designed for in-line four-cylinder performance motorcycles, the Mikuni RS Series Radial Flat Slide Carburetors offer superior horsepower gains with their maximum flowing smoothbore induction tract and radial flat slide design. An adjustable accelerator pump system helps to provide instant throttle response, particularly in the lower RPM range. The RS Series Carburetors feature a compact design which is 25% lighter than other performance Carburetors and uses readily available Mikuni jets.

Features of the RS Series Carburetors
Adjustable Pump Adjust Screws. Sets ON and OFF operation of accelerator pump in relation to throttle slide position.
Throttle Return Spring. A choice of positioning pegs allows adjustment of spring tension.
Idle Adjustment Screw. Controls engine idle speed.
Adjustment Accelerator Pump. Squirts fuel into carburetor venturi when throttle is opened to improve engine response.
Starter System. Provides fuel enrichment for cold engine starting.
Adjustable Pump Spray Nozzle. Shoots fuel directly into the intake tract for immediate engine response.
Jet Needle Clip. Easy adjustment feature for quick adjustment.
Flat Throttle Valve Design. Provides the strongest signal for precise and instantaneous throttle response.
Float Bowl Vent. Allows atmospheric pressure into float bowl for fuel flow.
Smooth Throttle Bore/Venturi. Produces the optimum air and fuel mixture flow at all RPM's.
Genuine Mikuni Jets and Tuning Components. Provides for precise fuel metering.
Pilot Air Jet. Use in conjunction with the Pilot Fuel Screw for tuning of mixture at idle to 1/4 throttle.

RS40-D12 Center Bell Crank

Fits Kawasaki
1984-86 Ninja 900R ZX900A
1986-87 Ninja 1000R ZX1000A

Fits Yamaha
1984-85 FJ1100
1986-92 FJ1200

For Race use on models listed

Carb Spacing (Throttle Shaft No.) A-B-C: 77-85-77 (700-17011)
Spigot (O.D.): ZX900- 44mm; All Others- 140mm
Main Jet N100.604: 140 (-2)
Jet Needle (J8-) (Clip Pos.): 9CHY03*
Needle Jet #568 (784-13002): Y-6
Pilot Jet (VM28/486): 17.5
Pilot Screw (Turns): 1/4-1/2